光纤放大网络及其应用研究进展

激光放大系统通常可分为高峰值功率和高平均功率两大类。近年来出现了越来越多同时需要这两种特性的应用,即要求系统能输出高峰值功率激光,能高效、高重复频率的工作,并具有高能量转化效率。针对不断增长的应用需求,相干放大网络(ICAN)计划基于啁啾脉冲放大、光纤分束放大和相干合束技术解决了高功率激光脉冲在光纤中的非线性损伤等限制功率提升的关键问题,在获得更高能量和峰值功率的同时避免了光纤中非线性效应导致的波形畸变,为突破若干限制高峰值功率、高重复频率脉冲激光系统发展的关键障碍提供了解决途径。光纤放大网络的可定标放大特性为许多新的应用提供了解决方案,如基于激光的粒子加速器、激光驱动核废料处理、地球轨道碎片清理和激光驱动聚变能等。

Design of Dispersion Compensation and Nonlinear Distortion Self-compensationin Co -network Transmission Systems

Dispersion and nonlinear distortion have an effect on transmission performanc es of optic al fiber transimission systems. The schemes of dispersion compensation and nonli near distortion self-compens ation in telecom-CATV co-network transmission systems are reported, followed by investigation on (1) the impact of dispersion compensation fiber (DCF) on fi ber nonlinear effects with a cascade of erbium-doped fiber amplifiers (EDFAs) an d different dispersion compensation schemes, (2) the impact of the complex on th e total nonlinear distortion induced by EDFA gain tilt and the light source. As a result , dispersion compensation optimal scheme and EDFA negative gain tilt are suggest ed as a solution to dispersion compensation and the nonlinear distortion self-c ompensation.

一种新型全光纤拉锥器件的研究

基于倏逝波理论,利用熔融拉锥技术,采用多种光纤,研制出了一种可以用于激光集束的多芯的全光纤器件。这种器件具有插入损耗小和器件芯间平行度高等优点。现已研制成功19芯和37芯光纤集束器,插入损耗<1 dB。这种新型光纤器件为光纤放大网络(FAN)集束提供一体化的阵列集束光纤,提高空间利用率,便于在大规模使用光纤的环境中应用。